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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment Property, Plant, and Equipment
Property, plant, and equipment consists of:
 December 31, 2023December 31, 2022Estimated Useful Life
Buildings and land$1,318 $1,301 
30 years - Buildings
Enterprise hardware and software1,857 1,855 3 years
Leaseholds1,787 1,774 Lesser of lease term or estimated useful life
Equipment1,263 1,222 7 years
Furniture202 201 5 years
Property, plant and equipment, gross6,427 6,353  
Accumulated depreciation(5,075)(4,931) 
Property, plant and equipment, net$1,352 $1,422  
Depreciation expense for the years ended December 31, 2023 and 2022 was $0.1 million and $0.1 million, respectively.